In choosing Indiana Gov. Mike Pence as his running mate, Donald Trump has reassured both establishment republicans and social conservatives — but he has also picked someone who in many ways is his polar opposite.

Pence addresses the Republican National Convention Wednesday night.

As a conservative talk show host in Indiana, Pence called himself "Rush Limbaugh on decaf."

The show was a springboard to runs for office that initially landed Pence flat on his face. He ran twice for the U.S. House of Representatives in 1988 and 1990, only to be decisively defeated after election records showed he used campaign funds to make mortgage payments, for golf fees, his wife's car payments, and other personal expenses. The payments were not illegal at the time but would become so under rules changes that followed the disclosure.

In his second campaign, Pence would use such nasty attack ads against his opponent, Democrat Philip Sharp that they "backfired," according to Sharp, giving a much larger victory over his GOP opponent.

Pence talks with fellow Republicans during the first session of the 112th Congress in 2011.

Credit Chip Somodevilla/Getty Images

Pence would later renounce his attack ads as "wrong," and swore off negative campaigning.

In 2000, he was finally elected to the U.S. House, where he served for 12 years, rising to the No. 3 Republican leadership position. And in 2012, he was elected governor of Indiana, succeeding the enormously popular Republican Gov. Mitch Daniels, known for balancing budgets and building a business-friendly environment.

'A Polarizing Figure'

Pence remained popular for his first couple of years as governor, but that would not last, according to Christine Matthews, a Republican pollster and president of Bellwether Research Group.

"Mike Pence is a polarizing figure in Indiana" now, she says.

At the beginning of his tenure, she observes, Pence, like Daniels avoided social issues and focused on economic development, tax cuts, and jobs.

Pence leaves a press conference at the Indiana State Library in Indianapolis in 2015, where he spoke about the state's controversial Religious Freedom Restoration Act.

Credit Aaron P. Bernstein/Getty Images

But that all changed when he moved to emphasize a conservative social agenda— a failed attempt to ban gay marriage; an abortion law so strict that it makes it illegal for a woman to have an abortion because of a fetal abnormality; and after the U.S. Supreme Court legalized same sex marriage, passage of a law that critics said authorized discrimination against gays and lesbians in the name of religious rights.

The state Religious Freedom Restoration Act, as it is known, "turned off suburban and college-educated voters," says pollster Matthews, and sent the state's business leaders "through the roof." Among those business executives was Angie's List founder Bill Oesterle, a longtime Republican activist, who threatened to abandon a major expansion of his company in the state.

Pence "was clearly pandering to some extreme players in the party here in Indiana," Oesterle says, "and that was a sign to all of us that he was deviating from what he had told us he was going to do."

In the end, the economic pressure pushed the Indiana governor to "cave," Oesterle observes. Pence, after pledging not to change the law, signed a so-called "fix," a compromise to soften the legislation.

But the whole episode, topped off by his support for the abortion measure, which was denounced by a significant number of pro-life female Republican state legislators, had its effect. Until he was chosen for the No. 2 spot on the national ticket, polls showed Pence only an even bet for re-election.

Still, the 57-year-old Pence is, in many ways, the do-no-harm choice as Trump's running mate. He may not expand Trump's appeal outside the GOP base, but establishment Republicans are comfortable with him, and social conservatives seem to have forgiven him for the "fix."

"Nobody gets 100 percent, so he's batting...maybe 85" says Curt Smith, president of the Indiana Family Institute and a delegate to the Republican National Convention. "That's a solid B-plus."

Yet, while Pence may seem boring next to Trump, he has important qualities.

Pence and his wife, Karen, leave a meeting with Trump in New York on Friday.

Credit Evan Vucci/AP

"He balances Mr. Trump out in terms of personalities," says political science professor Andrew Downs, director of the Center for Indiana Politics at Indiana University-Purdue University in Fort Wayne. "He is Midwestern polite. He's also very good at staying on message."

Relentlessly good at staying on message.

To cite one example, when the state's controversial religious freedom law was enacted, Pence appeared on ABC's This Week. In the 12 minute interview, host George Stephanopoulos tried unsuccessfully 12 separate times to get an answer to various versions of this question: If a florist in Indiana refuses to provide flowers for a gay couple's wedding, is that legal under the state's new religious freedom law, yes or no?

Pence's long, clumsy answers never addressed the question but left no sound bite to make news.

Pence may have to use that talent for evasion in the coming campaign. He has taken many positions, some reflected by his votes in Congress, that are dramatically different from Donald Trump's.

Pence has been a strong advocate of free trade, endorsing every trade agreement that's come before him, including the Trans-Pacific Partnership specifically opposed by Trump.

He has strongly opposed banning all Muslims from immigrating to the United States, noting that the U.S. constitution specifically protects people of all faiths. He grudgingly embraced Obamacare, taking the federal government's money for Medicaid expansion, but attaching more conservative strings to it. And unlike Trump, he supported the Iraq War.

The balancing act may prove tricky for this ticket, as illustrated when Lesley Stahl, interviewing Trump and Pence on 60 Minutes last Sunday, reminded Trump that his running mate had voted for the Iraq War.

"I don't care," Trump responded.

"What do you mean you don't care?" Stahl asked.

"It's a long time ago, and he voted that way and they were also misled," Trump answered.

Stahl then reminded Trump that he had harped on this very vote as evidence of Hillary Clinton's bad judgment.

"He's entitled to make a mistake every once in a while," Trump replied, nudging Pence.

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Forty-six delegates and 43 alternate delegates from Kentucky will be among the crowd at next week’s Republican national convention in Cleveland. Donald Trump is expected to formally accept the GOP nomination for president at the event.

The real estate mogul Trump won 79 of Kentucky’s 120 counties when state Republicans held their presidential caucus in March, but like elsewhere around the country, not every Kentuckian is enthusiastically supporting Trump. Owensboro businessman J. Todd Inman is going to the convention as a delegate from Kentucky.

“Donald Trump will be the nominee," stated Inman. "The question is what’s the process to get to that ultimately.”

Inman says Trump wasn’t his first choice, or his second for that matter, but his allegiance now stands with the billionaire businessman.